Illuminating sign-lamp.



J. G. SAFTIG.

ILLUMINATING SIGN LAMP. APPLICATION FILED MAR. 2 190B.

'Patenma. Feb. 9, 1909.

INVENTOR. c/kca 3. BY

ATTORNEY.

JACOB G. SAFTIG, OF SEATTLE, W ASHINGTONQ ILLIHVIINATING SIGN-LAMP.

Specification of Letters Patent.

Patented Feb. 9, 1909'.

Application filed March 26, 1908. Serial No. 4=23,431.

To all whom it may concern:

Be it known that 1, Moon G. SAFTIG, a citizen of the United States, residing at Seattle,

in the county of King and State of \Vashington, .have invented certain new and useful Improvements in Illuminating Sign-Lamps, of which the follwing is a specification, reference being had therein to the accompanying drawings.

The ob ec t of this invention is to treat the globes of electric lights in such manner that they will be peculiarly adapted for use with illuminated signs, by rendering the lights in such a way that the sign markings will be made more distinct and allow the same to be observed without pain to the eye-through the dazzling effect inherent to clear glass bulbs or of the lack of brilliancy in the sign characters due to'the use. of ground glass bulbs.

The inventionconsists in the novel con struction, combination and adaptation of parts, as will be hereinafter described and illustrated in the drawings.

In the drawings, Figure 1 is a face view of an. illuminated-letter employing incandescent light bulbs which embody this inven-- 1 tion; and Fig. 2 is a sectional View of the same taken through line 22 of Fig. 1, and drawn to an enlarged scale.

The reference numeral 5 designates the walls of a sign letter which, extend into a re-' cess of the sign-board and are painted white upon the inner faces 6 of the walls as well as the exposed rearface 7 of said recess. Spaced screw-sockets, such as 8,,are provided to at tachlamp bulbs 9 in place within the recess, as ordinary.

Upon the exterior of each ofthe lamps and.

at its outer end is a coating 10 of less diameter than the major diameter of the bulb, but such as to cover the lamp filament 11 from such as varnish,

sight when viewed from in front of the sign where employed. This coating is formed of a composition consisting of an amorphous pigment, such as zinc, and a viscid solution, producing a smooth, hard, and glossy surface which while semi-transparent will. reflect more or less of the light ack upon the rear face 7 ofthe letter-recess.

The aforesaid composition is usually applied to the bulbs while the latter is at a temperature of about one hundred degrees Fahwithin said walls and renheit, by dipping the same into the mix;

true; but it may be otherwise applied, as by laying on with abrush. The herein described composition will resist not only the effects of heat emanating from the lamp but also the influences of air and moisture.

A sign employing lamps treated according to my invention, has the letters exhibited with more deflniteness by reason of a large proportion of the light from the several lamps reflecting into the recesses of there spective letters at the same time allowing enough of the light to pass through the coating to render the appearance opalescent and obviate the dazzling effect upon the eyes of an observer where the filament is not masked I I as described; I

I am aware that incandescent lamps have been made with ground glass, and

sought for, they have no corresponding effect such as afforded by this invention in illuminated signs, or equivalent uses.

Having .described'my invention, what I claim, is-

1. In com ination with the walls of a sign letter, an in'can'decsent lamp globe arranged within the walls of said letter to have its outer end project slightly beyond the outer ends of said walls, said globe at its outer end being coated with a semi-transparent light reflectingmaterial which terminates at points approximately in alinem'ent with said outer ends'of said walls,'whereby a part of the light from said bulb will be reflected while they are valuable where a diffusive light is back onto the wall which forms the-rear end of the sign letter.

2. In combination with the walls of a sign letter, an incandescent lam globe disposed space therefrom, said globe at its outer end being coated with. a semi-transparent light reflecting material to reflect part of the light rays onto the wall which forms the rear end of the letter, whereby said reflect ed rays will be projectedoutwardly in the said space between globe and the sign letter walls.

the lamp In testimony whereof I afliX my signature I in presence of two witnesses. v

JACOB G. SAFTIG. Witnesses: k

Pmnnn BARNES, HORACE BARNns. 

